$B4/180: RS232 Write bit count/Tape Read timing Flag
Kernal-Reference:
DEC $B4 : $EECD $EEE7 $EEEE
INC $B4 : $EEF2 $EF00
LDA $B4 : $EEBB $F98B $F9AC $F9FC $FA14 $FA2F
STA $B4 : $F854 $FA42 $FA4C
STX $B4 : $EF1C
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